javascript - JSHint "not defined" errors -

i have function i'm using validate contact form, getting ton of "not defined" errors when run through jshint. quite jquery noob , i' not sure how these supposed defined.

(function ($, document, undefined) { $(document).ready(function(){      // place id's of required fields here.     required = ["name", "email", "message"];     // if using id other #email or #error replace here     email = $("#email");     errornotice = $("#error");     // text show within field when incorrect     emptyerror = "please fill out field.";     emailerror = "please enter valid e-mail.";      $("#theform").submit(function(){         //validate required fields         (i=0;i<required.length;i++) {             var input = $('#'+required[i]);             if ((input.val() == "") || (input.val() == emptyerror)) {                 input.addclass("needsfilled");                 input.val(emptyerror);                 errornotice.fadein(750);             } else {                 input.removeclass("needsfilled");             }         }         // validate e-mail.         if (!/^([a-za-z0-9_\.\-])+\@(([a-za-z0-9\-])+\.)+([a-za-z0-9]{2,4})+$/.test(email.val())) {             email.addclass("needsfilled");             email.val(emailerror);         }          //if inputs on page have class 'needsfilled' form not submit         if ($(":input").hasclass("needsfilled")) {             return false;         } else {             errornotice.hide();             return true;         }     });      // clears fields in form when user clicks on them     $(":input").focus(function(){               if ($(this).hasclass("needsfilled") ) {             $(this).val("");             $(this).removeclass("needsfilled");        }     }); }); })(jquery, document); 

here couple examples:

from form data - 'required' not defined.

required = ["name", "email", "message"]; 

'i' not defined.

for (i=0;i<required.length;i++) { 

and 'email' not defined.

if (!/^([a-za-z0-9_\.\-])+\@(([a-za-z0-9\-])+\.)+([a-za-z0-9]{2,4})+$/.test(email.val())) { 

you should define variables "var":

var required = ["name", "email", "message"]; for(var i...